A medium-frequency furnace is a power supply device that transforms the standard power frequency alternating current (AC) of 50Hz into a medium frequency range, typically between 300Hz and 1000Hz, and sometimes extending up to 10,000Hz. This process involves rectifying the three-phase power frequency AC into direct current (DC) and then converting this DC into an adjustable medium-frequency current. This current flows through a capacitor and an induction coil, generating high-density magnetic lines within the coil. These magnetic lines intersect with the metal material contained within the induction ring, inducing a significant eddy current within the metal.
Electromagnetic Induction Heating Principle: The medium-frequency heating furnace operates on the principles of electromagnetic induction heating, adhering to electromagnetic effect theories such as the electromagnetic ring effect, skin effect, sharp angle effect, proximity effect, diathermy effect, and conduction effect.
Core Components: The furnace primarily consists of a frequency converter and an induction coil. The frequency converter converts the 50Hz AC power into medium-frequency AC (ranging from 100Hz to 10,000Hz). It rectifies the three-phase power frequency AC into DC and then converts this DC into an adjustable medium-frequency current. This current flows through the capacitor and induction coil, generating high-density magnetic lines that intersect with the metal material in the induction ring, inducing large eddy currents within the metal.
Eddy Current Generation: The frequency conversion device and induction coil generate eddy currents within the heated metal materials. These eddy currents exhibit properties similar to medium-frequency currents, where the free electrons within the metal flow through the metal body, encountering resistance and generating heat. For instance, placing a metal cylinder within an induction coil carrying alternating medium-frequency current heats the cylinder's surface to redness or even melting, without direct contact with the coil. The coil itself remains at a low temperature, and the heating and melting speed can be controlled by adjusting the frequency and current strength. When the cylinder is centered within the coil, it heats uniformly without producing harmful gases or intense light, thus minimizing environmental pollution.
In summary, the medium-frequency heating furnace operates on the principle of electromagnetic induction, with its heating mechanism designed around various electromagnetic effects.
Rapid Heating and High Efficiency: These furnaces offer fast heating speeds, high production efficiency, reduced oxidation and decarburization, material and cost savings, and extended die life.
Superior Working Environment: They provide an improved working environment for workers, enhance company image, and are pollution-free with low energy consumption.
Uniform Heating and Precise Temperature Control: The heating is uniform, with minimal temperature differences between the core and surface, and high temperature control accuracy.
The furnace body features a squirrel-cage type frame structure made from high-quality steel plates through rolling and welding. It has removable covers on its windows and thick steel plates at the bottom. A supporting bracket for the lining pushing mechanism is located on the lower part of the furnace shell. Inside the shell, profiling magnetic yokes reduce magnetic leakage, prevent the frame structure from heating up, increase electrical efficiency, support the induction coils, and enhance their strength.
Without removing the yokes, assembly, disassembly, maintenance, observation, and heat dissipation of the induction coils can be conveniently performed. The furnace cover is lifted and swung by a hydraulic or manual system. An inspection hole on the top of the furnace cover allows for easy temperature measurement and alloy material supplementation. The use of a furnace cover reduces heat losses, power consumption, and production costs.
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